You can make money by casting Superheat Item on runite ore and coal, turning it into runite bars. It's highly recommended to set up a bank preset with a coal bag, 11 runite ores, 7 coal, and 11 nature runes. The preset should then be configured to be one of the two single-keypress buttons (which can be activated by pressing '1' and '2' respectively). This allows players to cast superheat item almost continuously. Add a coal bag in your banking sequence. It should be noted that Grand Exchange has a buy limit of 25,000 per 4 hours for coal, so it will limit the method.